https://www.thesistersofmercy.com/error404page.html (written by Andrew Eldritch ...

https://www.thesistersofmercy.com/error404page.html (written by Andrew Eldritch himself, like the whole site!)

Also:

  Once upon a midnight dreary, while I pron surfed, weak and weary, 
  Over many a strange and spurious site of 'hot xxx galore',
  While I clicked my fav'rite bookmark, suddenly there came a warning,
  And my heart was filled with mourning, mourning for my dear amour.
  "’Tis not possible!", I muttered, "give me back my free hardcore!"
  
  Quoth the server, 404